National Crane Published 10-30-2014 Control # 040-09 5-39
1400H OPERATOR AND SERVICE MANUAL SERVICE
JIB INSTALLATION AND ADJUSTMENT
1. Loosely bolt the two ear assemblies with shims and bars
as shown to the side of the first boom section. Note: All
measurements are in inches (mm).
2. Loosely bolt the hook assembly to the side of the first
boom section.
3. Extend the boom approximately one foot (300 mm).
4. Using an overhead hoist, lift the jib assembly and align
and pin the jib to the boom sheave head.
5. With jib pinned to the sheave head, swing the jib parallel
to the boom and install the pin which keeps the jib from
swinging (the pin is welded to a chain on the end of the
jib).
6. Slowly retract the boom until the jib ears are within 0.50
in (13 mm) of the ear assemblies on the first section.
Observe the vertical alignment of the jib ears and ear
assemblies and add or remove shims until the jib is
supported by the jib ears. The jib will typically rest only
on the upper support.
7. Observe the horizontal alignment of the slot in the ear
assemblies and the alignment pin in the jib. Horizontal
3/4 in GRADE 5
(TYP 4 PLCS)
0.38 (10) BAR
0.06 (1,6) SHIMS
0.38 (10)
BAR
0.06 (1,6)
SHIMS
0.38 (10) BAR
SHIMS
UPPER SUPPORT
JIB EARS
LOWER SUPPORT
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